Besides being unaware that your backup is being performed as a COPY_ONLY backup instead of not being backed up at all, are there any caveats that anyone can think of if this switch is set to default Y or even if it's used at all?
A COPY_ONLY full backup is still a full backup. The only difference between the two is the COPY_ONLY will not reset certain tracking bitmaps. This means your differential backups will eventually be the size of your database.
https://technet.microsoft.com/en-us/library/ms191495(v=sql.110).aspxhttps://learn.microsoft.com/en-us/sql/relational-databases/backup-restore/copy-only-backups-sql-server